Travelling from Vientiane to Chiang rai with a sedan car

I am currently in savannakhet and will be heading soon to vientiane to stay there for a week. After that it's time to go back to Thailand. Now this is my first trip in laos with a car.

I wanted to ask if it's wise to use a sedan car to travel from vientiane to ban huak border crossing (i have thai visa with a crossing limit which i purchased at the immigration office in thailand for 1000 baht)

- Does the Border @ ban huak works the same way like the border at mukdahan or non khai ?

i made the routing from chiang rai to HONGSA via the official border checkpoint north of NAN (BAN HUAI KON) - then to SAYABURI - then new shortcut to KASI - VANG VIENG - VIENTIANE - THAKHEK - no problems with our toyota vigo champ NGV-car - also with a sedan see no problems - mostly good roads! - don't know, if BAN HUAK has an offical border checkpoint for cars?!